watchurl.py

#!/usr/bin/env python

import sys
import hashlib
import urllib
import time
import commands
from datetime import datetime

def get_url_md5(url):
	md5 = hashlib.md5(urllib.urlopen(url).read()).hexdigest()
	print datetime.now().strftime('%Y-%m-%d %H:%M:%S'), url, md5
	return md5

def main(url, sleep):
	md5_start = get_url_md5(url)
	md5_tmp = md5_start
	while md5_start == md5_tmp:
		time.sleep(sleep)
		md5_tmp = get_url_md5(url)
	commands.getoutput('say file has been changed')

if __name__ == '__main__':
	main(sys.argv[1], int(sys.argv[2]) if len(sys.argv) == 3 else 30)